<MapboxGL.PointAnnotation />
PointAnnotation represents a one-dimensional shape located at a single geographical coordinate. PointAnnotation is legacy, soon to be deprecated, and should use ShapeSource and SymbolLayer instead.
PointAnnotation表示位于单个地理坐标处的一维形状。
PointAnnotation是遗留的，很快就会被弃用，应该改用ShapeSource和SymbolLayer。
只是起到点位的标识作用，可以设置提示信息，用法比较局限，推荐使用其它layer
props
| Prop | Type | Default | Required | Description |
|---|---|---|---|---|
| id | string |
none |
true |
A string that uniquely identifies the annotation |
| title | string |
none |
false |
The string containing the annotation’s title. Note this is required to be set if you want to see a callout appear on iOS. 包含批注标题的字符串。请注意，如果您希望看到IOS上出现标注，则需要设置此选项。 |
| snippet | string |
none |
false |
The string containing the annotation’s snippet(subtitle). Not displayed in the default callout. 包含注释片段(副标题)的字符串。不显示在默认详图索引中。 |
| selected | bool |
none |
false |
Manually selects/deselects annotation @type {[type]} |
| draggable | bool |
false |
false |
Enable or disable dragging. Defaults to false. |
| coordinate | array |
none |
true |
The center point (specified as a map coordinate) of the annotation. |
| anchor | shape |
{x: 0.5, y: 0.5} |
false |
Specifies the anchor being set on a particular point of the annotation. The anchor point is specified in the continuous space [0.0, 1.0] x [0.0, 1.0], where (0, 0) is the top-left corner of the image, and (1, 1) is the bottom-right corner. Note this is only for custom annotations not the default pin view. Defaults to the center of the view. 指定在注释的特定点上设置的锚点。锚点在连续空间[0.0，1.0]x[0.0，1.0]中指定，其中(0，0)是图像的左上角，(1，1)是右下角。注意：这只适用于自定义注释，而不是默认的管脚视图。<br />默认为视图的中心。 |
| x | number |
none |
true |
FIX ME NO DESCRIPTION |
| y | number |
none |
true |
FIX ME NO DESCRIPTION |
| onSelected | func |
none |
false |
This callback is fired once this annotation is selected. Returns a Feature as the first param. |
| onDeselected | func |
none |
false |
This callback is fired once this annotation is deselected. |
| onDragStart | func |
none |
false |
This callback is fired once this annotation has started being dragged. |
| onDragEnd | func |
none |
false |
This callback is fired once this annotation has stopped being dragged. |
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